Year	Percent
1982-01-01	15.673800000000000
1983-01-01	17.879000000000000
1984-01-01	18.314900000000000
1985-01-01	25.111900000000000
1986-01-01	28.727700000000000
1987-01-01	33.120300000000000
1988-01-01	28.568000000000000
1989-01-01	33.363500000000000
1990-01-01	34.190400000000000
1991-01-01	27.866900000000000
1992-01-01	30.233600000000000
1993-01-01	24.037900000000000
1994-01-01	16.734700000000000
1995-01-01	18.021000000000000
1996-01-01	17.715999999999998
1997-01-01	16.320000000000000
1998-01-01	15.586400000000000
1999-01-01	17.258500000000000
2000-01-01	16.727400000000000
2001-01-01	16.478200000000000
2002-01-01	15.620700000000000
2003-01-01	13.280700000000000
2004-01-01	0.213594000000000
2005-01-01	17.638100000000000
2006-01-01	17.125900000000000
2007-01-01	17.541700000000000
2008-01-01	16.923300000000000
2009-01-01	21.300900000000000
2010-01-01	21.538800000000000
2011-01-01	21.571600000000000
2012-01-01	22.179500000000000
2013-01-01	20.450000000000000
2014-01-01	19.608000000000000
2015-01-01	17.885300000000000
2016-01-01	17.304300000000000
2017-01-01	16.676300000000000